Thought of a couple of more things. You don't say how old your boys are, so some of this may not apply.
A. Fantasia Gardens miniature golf -- just across the street.
B. The beach area at Swan/Dolphin has swan paddleboats, spontaneous beach games (volleyball), etc.
C. If one/both are still young enough, you can walk over to the Yacht & Beach Club to catch a "pirate cruise" one morning.
D. Are they into collecting pressed pennies? There are a number of those machines within walking distance in the general Boardwalk area.
E. If they are teenagers, then they might enjoy lunch/dinner/snack at the ESPN Club over at the Boardwalk (short walk or catch the boat).
F. There is a fun ice cream/soda fountain restaurant on property. I think it is at the Swan.
G. Are you there during Food and Wine Festival? If so, then definitely go for Park Hoppers and pop over in the afternoons/evenings to Epcot to sample the offerings. If you walk or take the boat you'll enter from the back of Epcot. One time you can walk in starting towards Mexico, the next towards Canada. Think a progressive lunch or dinner of snack sized servings. Do meal, then dessert in each direction. Lots to choose from. Might enjoy Eat to the Beat concerts, too.
H. Leave your hotel about 2 to 2.5 hours before the fireworks at the MK. Do a Food and Wine snack dinner through Epcot, then take the monorail to the TTC. Just walk around the corner of the Polynesian to the beach area facing MK and settle in to enjoy the fireworks from their beach. You might be able to sit where you can enjoy their beach movie, too. If you are there during
MNSSHP, you can catch Hallowishes. Hit the snack bar at the Poly if you want to enjoy dessert at the beach. If it is EMH night at Epcot, you can go back through Epcot. Otherwise take the boat or monorail over to MK and catch the bus back.
For future trips note that Santa and Mrs. Claus (decked out in their tropical wardrobe) visit here, too. The adults line up like crazy for photos, too! Just google it for pics, etc.